BRP Jackson Racing or 4 ribbed Eaton MP 62 Tensioner
 

Up for sale is a BRP Supercharger Belt Tensioner for A/C, Power steering Equipped 90-05 Miatas. This sturdy piece of equipment has been gently used and makes an incredible improvement over Moss 1st generation and 2nd generation supercharger tensioners. The best thing about this pully tensioner is that it allows up to two inches of tension adjustment, so that you never run out of adjustment (a big disadvantage for moss motors crap) Want to get rid of belt squeel and make changing belts a breeze, this is just what you need. Included is the Track Dog Racing idler pulley with machined angle to offset belt torque and maintain proper alignment. Asking 100 dollars plus shipping. Paypal is preferred!
http://www.miata.net/isclassifieds/pictures/75401.jpg

Asking 50 dollars plus shipping. Anyone interested?

Think that thing would work on the M45 JRSC Setup??

Yes it works with either the JRSC MP45 Supercharger or the MP62 Moss Motors, TDR, BRP Supercharger. I used to run a Jackson Racing MP45 setup. This is much better than Moss 1st Generation(belt removal and replacement is a breeze with BRP)and 2nd Generation(BRP allows extra 2 inches of tensioning travel compared to Moss 1 inch travel)